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//
//           Panzer: A partial differential equation assembly
//       engine for strongly coupled complex multiphysics systems
//                 Copyright (2011) Sandia Corporation
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#include "PanzerDiscFE_config.hpp"
#include "Panzer_GlobalIndexer.hpp"
#include "Panzer_IntrepidOrientation.hpp"

namespace panzer {

  void buildIntrepidOrientation(std::vector<Intrepid2::Orientation> & orientation,
                                const Teuchos::RCP<panzer::ConnManager> & connMgr)
  {
    using Teuchos::rcp_dynamic_cast;
    using Teuchos::RCP;
    using Teuchos::rcp;

    orientation.clear();

    // Retrive element blocks and its meta data
    const int numElementBlocks = connMgr->numElementBlocks();

    std::vector<std::string> elementBlockIds;
    std::vector<shards::CellTopology> elementBlockTopologies;

    connMgr->getElementBlockIds(elementBlockIds);
    connMgr->getElementBlockTopologies(elementBlockTopologies);

    TEUCHOS_TEST_FOR_EXCEPTION(numElementBlocks <= 0 &&
                               numElementBlocks != static_cast<int>(elementBlockIds.size()) &&
                               numElementBlocks != static_cast<int>(elementBlockTopologies.size()),
                               std::logic_error,
                               "panzer::buildIntrepidOrientation: Number of element blocks does not match to element block meta data");

    // Currently panzer support only one type of elements for whole mesh (use the first cell topology)
    const auto cellTopo = elementBlockTopologies.at(0);
    const int numVertexPerCell = cellTopo.getVertexCount();

    const auto fp = NodalFieldPattern(cellTopo);
    connMgr->buildConnectivity(fp);

    // Count and pre-alloc orientations
    int total_elems = 0;
    for (int i=0;i<numElementBlocks;++i) {
      total_elems += connMgr->getElementBlock(elementBlockIds.at(i)).size();
    }

    orientation.resize(total_elems);
    // Loop over element blocks
    for (int i=0;i<numElementBlocks;++i) {
      // get elements in a block
      const auto &elementBlock = connMgr->getElementBlock(elementBlockIds.at(i));

      const int numElementsPerBlock = elementBlock.size();

      // construct orientation information
      for (int c=0;c<numElementsPerBlock;++c) {
        const int localCellId = elementBlock.at(c);
        Kokkos::View<const panzer::GlobalOrdinal*,Kokkos::HostSpace>
          nodes(connMgr->getConnectivity(localCellId), numVertexPerCell);
        orientation[localCellId] = (Intrepid2::Orientation::getOrientation(cellTopo, nodes));
      }
    }
  }

  Teuchos::RCP<std::vector<Intrepid2::Orientation> >
  buildIntrepidOrientation(const Teuchos::RCP<const GlobalIndexer> globalIndexer)
  {
    using Teuchos::rcp_dynamic_cast;
    using Teuchos::RCP;
    using Teuchos::rcp;

    auto orientation = rcp(new std::vector<Intrepid2::Orientation>);

    {
      RCP<const GlobalIndexer> ugi
        = rcp_dynamic_cast<const GlobalIndexer>(globalIndexer);

      if (ugi!=Teuchos::null) {
        const auto connMgr = ugi->getConnManager()->noConnectivityClone();

        TEUCHOS_TEST_FOR_EXCEPTION(connMgr == Teuchos::null,std::logic_error,
                                   "panzer::buildIntrepidOrientation: ConnManager is null!");

        buildIntrepidOrientation(*orientation, connMgr);
        return orientation;
      }
    }

    TEUCHOS_TEST_FOR_EXCEPTION(true,std::logic_error,
                               "panzer::buildIntrepidOrientation: Could not cast GlobalIndexer");
  }

} // end namespace panzer
